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subroutine expr
c
c analyseur d'expressions
c
c Copyright INRIA
INCLUDE '../stack.h'
parameter (nz1=nsiz-1,nz2=nsiz-2)
c
integer op,r,blank,sign,plus,minus,name,colon,eye(nsiz),ou,et
integer equal,less,great,not,eol
logical eptover
data colon/44/,blank/40/,plus/45/,minus/46/,ou/57/,et/58/
data equal/50/,less/59/,great/60/,not/61/
data eye/672014862,nz1*673720360/,name/1/,eol/99/
c
if (ddt .eq. 4) then
write(buf(1:8),'(2i4)') pt,rstk(pt)
call basout(io,wte,' expr pt:'//buf(1:4)//' rstk(pt):'
& //buf(5:8))
endif
c
r = rstk(pt)
ir=r/100
if(ir.ne.1) goto 01
goto(05,06,25,26,61,73,74,82,83,86,87,102,104,105),r-100
c
01 if(sym.ge.ou.and.sym.le.great) then
call error(40)
return
endif
02 continue
kount = 1
if(sym.eq.not) goto 70
if (sym .eq. colon) call putid(syn(1),eye)
c if (sym .eq. colon) sym = name
03 sign = plus
if (sym .eq. minus) sign = minus
if (sym.eq.plus .or. sym.eq.minus) call getsym
if ( eptover(1,psiz-1)) return
pstk(pt) = sign + 256*kount
rstk(pt) = 101
icall=2
c *call* term
return
05 sign = mod(pstk(pt),256)
kount = pstk(pt)/256
pt = pt-1
if (sign .ne. minus) goto 10
rhs=1
pt=pt+1
pstk(pt)=kount
fin=minus
rstk(pt)=102
icall=4
c *call* allops(minus)
return
06 kount=pstk(pt)
pt=pt-1
10 if (sym.eq.plus .or. sym.eq.minus) go to 20
if(rstk(pt).eq.113) goto 104
if(rstk(pt).eq.112) goto 102
if(sym.eq.eol) goto 50
if(sym.ge.ou.or.sym.eq.equal) goto 70
go to 50
20 if (rstk(pt) .ne. 301) go to 21
c blank or tab is delimiter inside angle brackets
ls = lpt(3) - 2
if (abs(lin(ls)).eq.blank.and.abs(lin(lpt(3))).ne.blank) go to 50
21 op = sym
call getsym
pt = pt+1
pstk(pt) = op + 256*kount
rstk(pt) = 103
icall=2
c *call* term
return
25 op = mod(pstk(pt),256)
kount = pstk(pt)/256
rhs=2
pstk(pt)=kount
rstk(pt)=104
fin=op
icall=4
c *call* allops(op)
return
26 kount=pstk(pt)
pt=pt-1
go to 10
50 if (sym .ne. colon) go to 60
call getsym
kount = kount+1
go to 03
60 if (kount .gt. 3) then
call error(33)
if (err .gt. 0) return
endif
rhs = kount
if (kount .le. 1) return
pt=pt+1
rstk(pt)=105
fin=colon
icall=4
c *call* allops(colon)
return
61 pt=pt-1
r = rstk(pt)
ir=r/100
if(ir.ne.1) return
goto(05,06,25,26,61,73,74,82,83,86,87,102,104,105),r-100
c
c in-line lexpr
70 continue
if (ddt .eq. 4) then
write(buf(1:8),'(2i4)') pt,rstk(pt)
call basout(io,wte,' lexpr pt:'//buf(1:4)//' rstk(pt):'
& //buf(5:8))
endif
72 continue
if (eptover(1,psiz-1)) return
if(sym.eq.ou) then
c call getsym
pstk(pt)=ou
else
pstk(pt)=0
endif
pstk(pt)=pstk(pt)+256*kount
rstk(pt)=106
c *call* lterm
goto 80
73 continue
op = mod(pstk(pt),256)
kount = pstk(pt)/256
pt=pt-1
if(op.eq.0) goto 75
icall=4
fin=ou
rhs=2
pt=pt+1
rstk(pt)=107
pstk(pt)=kount
c *call* allops(ou)
return
74 continue
kount=pstk(pt)
pt=pt-1
75 if(sym.eq.ou) goto 72
goto 50
c
c in-line lterm
80 continue
if (ddt .eq. 4) then
write(buf(1:8),'(2i4)') pt,rstk(pt)
call basout(io,wte,' lterm pt:'//buf(1:4)//' rstk(pt):'
& //buf(5:8))
endif
81 continue
if (eptover(1,psiz-1)) return
if(sym.eq.et) then
pstk(pt)=et
else
pstk(pt)=0
endif
pstk(pt)=pstk(pt)+256*kount
rstk(pt)=108
c *call* lfact
goto 85
82 continue
op = mod(pstk(pt),256)
kount = pstk(pt)/256
pt=pt-1
if(op.eq.0) goto 84
icall=4
fin=et
rhs=2
pt=pt+1
pstk(pt)=kount
rstk(pt)=109
c *call* allops(et)
return
83 continue
kount=pstk(pt)
pt=pt-1
84 if(sym.ne.et) goto 73
goto 81
c
c in-line lfact
c
85 continue
if (ddt .eq. 4) then
write(buf(1:8),'(2i4)') pt,rstk(pt)
call basout(io,wte,' lfact pt:'//buf(1:4)//' rstk(pt):'
& //buf(5:8))
endif
if ( eptover(1,psiz-1)) return
pstk(pt)=0
if(sym.eq.not.and.char1.ne.equal) then
pstk(pt)=not
call getsym
endif
pstk(pt)=pstk(pt)+256*kount
rstk(pt)=110
c *call* lprim
goto 100
86 continue
op = mod(pstk(pt),256)
kount = pstk(pt)/256
pt=pt-1
if(op.eq.0) goto 82
fin=op
rhs=1
pt=pt+1
pstk(pt)=kount
rstk(pt)=111
icall=4
c *call* allops(not)
return
87 kount=pstk(pt)
pt=pt-1
goto 82
c
c in-line lprim
c
100 continue
if (ddt .eq. 4) then
write(buf(1:8),'(2i4)') pt,rstk(pt)
call basout(io,wte,' lprim pt:'//buf(1:4)//' rstk(pt):'
& //buf(5:8))
endif
if(mod(pstk(pt),256).ne.0) goto 101
if(sym.ne.et.and.sym.ne.ou) goto 103
call getsym
C modif SS
C if(sym.ge.ou.or.sym.eq.equal) goto 70
if ( eptover(0,psiz-1)) return
101 pt=pt+1
rstk(pt)=112
icall=1
c *call* expr
goto 02
102 pt=pt-1
if(sym.ne.equal.and.sym.lt.less.or.sym.eq.eol) goto 86
103 op=sym
call getsym
c if(rstk(pt-3).ne.803) then
if(op.eq.equal.and.sym.ne.equal) then
call msgs(7,0)
endif
c endif
if(sym.eq.equal.or.sym.eq.great) then
if(op.ne.equal) op=op+sym
call getsym
if(op.eq.not+equal) op=less+great
endif
pt=pt+1
rstk(pt)=113
pstk(pt)=op
icall=1
c *call* expr
goto 02
104 fin=pstk(pt)
rhs=2
rstk(pt)=114
icall=4
c *call* allops(fin)
return
105 continue
goto 102
c
c 999 call error(22)
c if (err .gt. 0) return
c return
end
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